Electronic keyboard instrument



FIG. 1 is a perspective view of an electronic keyboard instrument showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

Features shown with broken lines in the figures are intended to show environmental structure only, and form no part of the claimed design. 

The ornamental design for a electronic keyboard instrument, as shown and described. 